The FFT is part of standard Espruino (via the E.FFT method) and is written in C - the NRF52 parts do have a 32 bit hardware FPU, but it's not actually used.
There's actually an issue open that I started a week ago about moving the FFT to float32 - as I don't think anyone is really using the accuracy of float64 for the FFT. It would definitely improve speeds.
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